while its possible to upload & display images with spaces in their name, it's not possible to edit or delete them. example here.

[disclaimer: i, myself, would never ever uses spaces in filenames, especially not if those files are intended for the internet.]

It's the same old %20 vs. + problem. You can get to the pages if you replace + with %20 in the URL, but the forms won't work so you'll have to hand-code the query-string, which is not for everyone.

I'm pondering a Helma-level solution to that problem.